Paper making machine



Jan. 2, 1940. i G. J. FORMAN PAPER MAKING MACHINE Filed July 19, 1935 3 Sheets-Sheet 1 N s E Sworn WM G'eor g e JForm cuv,

Jan. 2, 1940. J FQRMAN I 2,185,913

PAPER MAKING MACHINE Filed July 19. 1935 3 Sheets-Sheet 2 v u u I Q o I w, 5% 064% J. 7 "orman Jan. 2, 1940. J FORMAN 2,185,913

PAPER MAKING MACHINE Filed July 19, 1935 3 Sheets-Sheet 3 z 3 l i George, J 722777116120,

Patented Jan. 2, 1940 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to improvements in paper-making machines.

Primarily, the object of the invention is to provide a paper-making machine on which paper of 6 unusual strength can be produced, the machine being especially adapted for the production of heavy paper board and wall board.

More specifically, the invention contemplates a paper-making machine in which theprinciples of 10 the usual cylinder forming machines and Four- Another object is to provide a paper-making,

machine wherein stock having a large water content can be used, a feature which is essential for the production of strong or heavy paper.

With these and other objects in view, the invention consists in certain details of construction and combinations and arrangements of parts, all as will hereinafter be more fully described and the novel features thereof particularly pointed out in the appended claim.

In the accompanying drawings, illustrating gm preferred embodiment of the present inven- Figure l is a vertical sectional view taken longitudinally of the paper-forming belt or transversely of the cylinder carrying the belt on which the paper stock is deposited from the flow box, portions of the machine toward what might be termed the discharge terminal of the forming a belt being omitted;

Fig. 2 isa top plan view of shown in Fig. 1;

Fig. 3 is a detail vertical sectional view on the line 3-3 of Fig. 2; and 5 Fig. 4 is a vertical sectional view taken transthe structure versely of the forming belt on the line 4-4 of' Fig. 2.

Fig. 5 is a detail horizontal sectional view of line 5-5 of Fig. 1.

. The web of paper is formed from liquid paper stock deposited on an endless, traveling, foraminous forming belt I!) adapted to travel around a perforated cylinder ll journaled to revolve on an axis extending parallel to what will be termed the front wall of the paper stock flow box l3. If

desired, the cylinder is supported on guide rollers Il Preferably, the belt It] extends in horizontal lower and upper reaches from the cylinder II. Within the cylinder ll there is a vacuum chambet I! comprising front and rear walls I5, l6, both arranged at an angle to the horizontal for purposes which will be later described. Suitable exhausting means (not shown) are provided in connection with said vacuum chamber for the purpose of withdrawing from said chamber water entering the same from stock carried by the belt Ill. The flow box I8 is provided with bafiles l8 and its portions I! project beyond the front wall l2 and a considerable distance over the belt l and beyond the cylinder l I. In order to build up or form, on the belt HI, as ittravels around cylinder l I, a strong, heavy paper web, the apron 20, projecting forwardly from the front wall l2 of the flow box and which defines the lower limit of the area over which the stock has access to the traveling belt, engages said belt at a point below the front wall l of the vacuum chamber. By maintaining the liquid stock in the flow box at a level above the upper reach of the belt I 0, stock is deposited on the belt from the' point at which the apron 20 engages said belt to a point beyond where the upper reach of belt l0 leaves cylinder II. To preventloss of stock, suitable; packing may be provided along the lower edge of the sides IQ of the flow box and one or more gates 2|, 22, are arranged transversely of the belt between the two sides IQ of the flow box.

Due to the extended area of the belt l0 exposed to stock in the box, paper of substantially any thickness can be formed. The gates 2|, 22,

will, of course, be adjusted vertically to accommodate the thickness of paper being produced at any one time. The gates may also be provided with means for adjusting them longi- 40 tudinally of the belt. Also, a paper of high grade can be produced because the arrangement described permits the use of a large volume of water in the stock. For instance, by reason of the apron 20 being positioned below the front wall I! of the vacuum chamber, a portion of the water will drain from the stock into cylinder ll. Then, from the front wall l5 to the rear wall l6 of the vacuum chamber, water will be extracted from the stock by means of the vacuum in said chamber. Further, due to the weight imposed by the stock on the fibers adhering to the belt, additional water will be expressed from the web being formed after it passes the rear wall 16 of the vacuum compartment. A portion of the water expressed from the web at this time will enter cylinder II but the greater portion of it will be collected in reservoirs 23, 24, located beneath the upper reach of the belt. In other words, water will be extracted from the stock initially by gravity; then, by suction; and, after the web passes the rear wall ii of the vacuum chamber, by the combined action of pressure and gravity. In order to permit the production of two grades or colors of paper on the present machine, if desired, the flow box is divided into a plurality of compartments by a partition 28, and the cylinder II is likewise provided with a partition 21, while a partition 28 is provided within the vacuum compartment H. The partition 26 in the flow box extends outwardly over the cylinder l l and upper reach of the forming belt I, with its outer extremity engaging against the gate 2 I, and beneath the upper reach of said belt there is a partition 29 dividing the collecting receptacles 23, 24, longitudinally of the belt. With this arrangement, two different grades of stock or two stocks of difierent colors can be supplied to the two compartments formed in the flow box by partition 26 and the two different stocks will form into two separate strips of paper web on the belt until the web passes the last one of the gates 2 I, 22, being used, whereupon the two separate strips will merge into a single web due to the fact that substantially the entire water content has been removed at that time. By reason of the cylinder I! being provided with partition 21, the liquid recovered from the two stocks, particularly if they are of different colors, will be recovered separately, one end of the cylinder discharging into a reservoir 30 and the opposite end into a reservoir 3|. Likewise, .water draining onto collectors 23, 24, will drain into receptacles 30 3 I which communicate with receptacles 30, 3|, through conduits 32. The partition 28 in the vacuum compartment M will, of course, require the use of two connections, preferably connected to a single pump, as indicated in Fig. 3.

In the case of each one of the partitions in the the others will be adjusted to position all of them in alinement. By having them adjustable, the two difierent grades or colors of paper can be made of any desired width. For instance, with the machine having a forming belt of, say, 80 inches in Width, two separate strips of 50 and 30 inches, respectively, can be formed, or any other widths can be made by simply adjusting the several partitions.

It will be observed that the wall iii of vacuum compartment I4 is practically vertical and wall l5 substantially so. Therefore, after the force of the vacuum has extracted the water from the web of stock on the belt, the disposition of these front and rear walls facilitates the flow of the water toward the lower portion of the compartment from which it is removed and recovered.

To further aid in extracting water from the stock as it forms into the web on the forming cylinder, a perforated cylinder 34 is arranged in the upper portion of the flow box longitudinally of the forming cylinder I l and in close proximity to the latter. A certain amount of water will be expressed from stock passing between the two cylinders, a portion of said water entering the vacuum compartment l4 and a portion entering said cylinder 34. A partition 34 is also provided in cylinder 34 to maintain water of different stocks separated and said partition is adjustable longitudinally of said cylinder on a guide rod 35 by screws 34 operable by gears 34.

What I claim is: I

In a paper-making machine, the combination of a stock flow box, a perforate cylinder on a horizontal axis paralleling one side wall of said box, an endless traveling belt extending partially around said cylinder and extending from said cylinder in horizontal upper and lower reaches, said cylinder and belt being located exteriorly of said box, a vacuum chamber within said cylinder for removing liquid from stock on said belt, two opposite side walls of the box extending beyond and overhanging said cylinder beside said upper reach of belt, means positioned beyond said cylinder preventing excess stock flowing over the upper reach of said belt between said opposite side walls, and a feeding apron projecting from the first-mentioned box wall into proximity to the belt around the cylinder in substantially the same horizontal plane of the cylinder axis and below said vacuum chamber.

.GEORGE J. FORMAN. 

